/Engine/Source/Editor/EditorWidgets/Public/Filters/SAssetFilterBar.h
Function to check if a given type category is in use
bool IsTypeCategoryInUse ( [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FFilterCategory](API\Developer\ToolWidgets\Filters\FFilterCategory) > TypeCategory, [TArray](API\Runtime\Core\Containers\TArray)< [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FCustomClassFilterData](API\Editor\EditorWidgets\Filters\FCustomClassFilterData) >> Classes ) const